Is it not possible to just cut the stock header right after the 3-2-1 merge? Instead of having to do the merge yourself.

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IMO, if you're already doing the work to remove the exup, might as well get rid of the stock collector as well. Look at the 2nd pic in my original post, any true 3-1 collector is going to out flow that. It helps too if you have fabrication skillz, it cuts down on the cost you have to pay others to cut/fit/weld. But even if you have to pay someone to do it, I know of others who have had this done for around $100 bucks plus parts, which really isn't too bad.

__________________If you can rely on your ability, you don't have to worry about reliability.

IMO, if you're already doing the work to remove the exup, might as well get rid of the stock collector as well. Look at the 2nd pic in my original post, any true 3-1 collector is going to out flow that. It helps too if you have fabrication skillz, it cuts down on the cost you have to pay others to cut/fit/weld. But even if you have to pay someone to do it, I know of others who have had this done for around $100 bucks plus parts, which really isn't too bad.

I am doing a custom side exhaust for my street fighter - the pipe will be fairly short so wouldn't the bad flow help cause a little back pressure that it'll be lacking otherwise?

Just got mine done today, was about a 5 hour job with the help of my buddy Kevin. I had the bike dynoed on Thursday with just the Akra slip and will be going back this next Thursday to see if anything was gained.